Which payment provider is the error occurring in? Have you also tried to complete your purchase via an incognito window, a different browser, or a different device, to see if the issue persists elsewhere?
I also recommend checking your abandoned checkouts, to see if the purchase attempt appears there. If it does, oftentimes an error message can be seen within the order, which should explain and clarify the issue further. You can follow the instructions below to check this on your end:
If you're currently testing your store's checkout, just a reminder that we have a couple of resources to help with placing a test order on your store:
Thanks for confirming, @Muzzite.
Seeing as you're using Paystack as your payment provider, have you reached out to their support team directly to alert them of this situation? We don't have access to Paystack from our end, as it's a third-party payment provider that operates outside of Shopify — so if you haven't already done so, contacting their support team will be your next best step here as they're best equipped to support you with directly troubleshooting their gateway.
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